Race Condition in Linux Kernel Affecting Action Lifecycle Management

CVE-2026-53264

What is CVE-2026-53264?

CVE-2026-53264 is a vulnerability found in the Linux kernel that affects the management of action lifecycles within network scheduling. Specifically, this race condition occurs when two processes—NEWTFILTER and DELFILTER—are executed concurrently. During this scenario, a situation arises where one process may attempt to access memory that has already been freed by the other process, leading to a use-after-free (UAF) condition. Such vulnerabilities can have severe implications for organizations, as they can lead to system crashes, unauthorized access to sensitive data, or remote code execution, compromising the integrity and availability of the affected systems.

Technically, the vulnerability involves a race condition stemming from improper mutual exclusion when handling reference counts and memory freeing operations. The flaw allows a prior action to be freed while another is still accessing it, which can yield unpredictable behavior and system instability. To resolve this, a patch has been introduced that utilizes RCU (Read-Copy-Update) mechanisms to defer memory freeing until it is safe to do so, effectively eliminating the race condition inherent in prior implementations.

Potential impact of CVE-2026-53264

1. System Instability: The vulnerability can lead to unexpected behavior in network operations, causing systems to crash or become unresponsive during high-load situations, which can disrupt services and operations for organizations relying on consistent network performance.

2. Data Corruption or Loss: Given that the race condition can lead to invalid memory accesses, this may result in data corruption or loss. Critical data held in memory could be inadvertently altered or rendered inaccessible, leading to potential data recovery costs and operational setbacks.

3. Unauthorized Access and Exploitation: If exploited, this vulnerability may allow attackers to execute arbitrary code with elevated permissions, provided they can control the conditions of the race condition. This potential for remote code execution poses significant security risks, including the possibility of gaining unauthorized access to sensitive information or further propagating malware within an organization’s network.

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CVE-2026-53264

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